Name: USA Truflate type couplers and plugs, Automotive type sockets and nipples; Shape: Female, male, push on hose ... : 1 / 4", 3 / 8", 1 / 2"; Coupler type: Truflate type, automotive type; Surface treatment: Zinc plated; Working pressure: No more than ... its working pressure, air leakage, surface finishing and thread test. Automotive Type Pneumatic Coupler